Remove unused UDSearchResult

Sources/XXClient/Models/UDSearchResult.swift

-import Foundation
-
-public struct UDSearchResult: Equatable {
-  public init(
-    id: Data,
-    publicKey: Data,
-    facts: [Fact]
-  ) {
-    self.id = id
-    self.publicKey = publicKey
-    self.facts = facts
-  }
-
-  public var id: Data
-  public var publicKey: Data
-  public var facts: [Fact]
-}